Electrical appliances sold in the United Kingdom must be fitted with a prewired plug in accordance with the U.K. Plugs and Sockets Etc (Safety) Regulations 1994 and as updated by European Union law.
Plugs in the UK are supplied with 3-, 5- or 13-amp fuses. The 13-amp fuses should be used in a plug for appliances that consume a large amount of electricity, such as fan heaters or kettles. While the task of rewiring or replacing a 13-amp plug is straightforward, it’s imperative you connect the correct colored wires to each of the three plug terminals.
6 Take time when wiring the U.K. 13-amp plug to be certain that the connections are tight and correct. If you are unsure about wiring a plug, ask an electrician to do it for you.
Position the plug on a suitable table with the three prongs are showing. All U.K. plugs with 13-amp fuses have one prong at the top of the plug and two near the neck. Unscrew the central large screw from the base of the plug. Unscrew the two smaller screws at the neck of the plug enough to allow the wire to go under the band that will hold the wire in place. Some plugs have a plastic grip instead of a band. Remove the plug cover.
Unscrew each of the terminal screws a few turns. Don't unscrew too much, otherwise the screw will fall out.
Tighten the screws at the neck of the plug to fasten the complete wire. Turn the plug over and screw the cover on the plug. Insert the plug in a socket to test whether the appliance operates.